The magnetic ordering in high magnetoresistance Mn-doped ZnO thin films

S. Venkatesh, Abdulaziz Mohammed Salem Ba Ras, J.-S. Lee, Iman S. Roqan

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We studied the nature of magnetic ordering in Mn-doped ZnO thin films that exhibited ferromagnetism at 300 K and superparamagnetism at 5 K. We directly inter-related the magnetisation and magnetoresistance by invoking the polaronpercolation theory and variable range of hopping conduction below the metal-to-insulator transition. By obtaining a qualitative agreement between these two models, we attribute the ferromagnetism to the s-d exchange-induced spin splitting that was indicated by large positive magnetoresistance (∼40 %). Low temperature superparamagnetism was attributed to the localization of carriers and non-interacting polaron clusters. This analysis can assist in understanding the presence or absence of ferromagnetism in doped/un-doped ZnO.
Original languageEnglish (US)
Pages (from-to)035019
JournalAIP Advances
Volume6
Issue number3
DOIs
StatePublished - Mar 24 2016

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